If you open your css file: https://uploads-ssl.webflow.com/5c0a2238718a0a5aec8b4886/css/yacines-stunning-project.webflow.b2a761556.min.css
Use search to look for the fonts being called:
You can see the selectors that are calling these fonts, which there are a few for each of the three listed in the screenshots (montserrat, open sans, varela). You can then find those elements on your site for instance finding your h4:
You can see Open Sans is selected. You should clear that option by option clicking on the blue labels next to Font and Weight.
As a side note, you don’t need to assign properties for every class you are creating. For instance if you create a class on your H1 here and then redefine all of the font styles that are identical to your plain H1, you are creating a lot of redundant CSS rules on your website, which makes it much harder to update/manage over time.
Imagine if you have to change the font family for every H1 on your site. If you have that defined in one place, the basic “H1” selector (“All H1 Headings” in webflow) you can simply update it there vs having to go through every H1 you have given a class for and then re-assigned the font family on. If you are using Muli on every H1, you don’t have to define it on every class you are adding on top of an H1. CSS cascades from the top down, so if you have defined Muli on the plain H1 selector, you don’t have to define it on “Heading 42 Copy”.
Styles set on H1 will cascade down to your Heading 42 Copy, unless they are overwritten by the more specific selector.
H1 > Heading 42 Copy
Does that make sense?